Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993385AbXEBPig (ORCPT ); Wed, 2 May 2007 11:38:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2993386AbXEBPig (ORCPT ); Wed, 2 May 2007 11:38:36 -0400 Received: from www.osadl.org ([213.239.205.134]:52056 "EHLO mail.tglx.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2993385AbXEBPif (ORCPT ); Wed, 2 May 2007 11:38:35 -0400 Subject: Re: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ, CONFIG_HIGH_RES_TIMERS From: Thomas Gleixner Reply-To: tglx@linutronix.de To: Andrew Morton Cc: Mark Lord , Daniel Walker , Linux Kernel , Linus Torvalds In-Reply-To: <20070502010527.e64dcce9.akpm@linux-foundation.org> References: <46364EBC.5050804@rtr.ca> <46364F5A.2030208@rtr.ca> <463653A3.5040606@rtr.ca> <46367D7E.6060502@rtr.ca> <1177976798.12796.286.camel@imap.mvista.com> <463683A6.4010505@rtr.ca> <1178026458.5791.305.camel@localhost.localdomain> <4637419D.8010303@rtr.ca> <463741F1.7050706@rtr.ca> <1178027285.5791.307.camel@localhost.localdomain> <46374B1D.6050509@rtr.ca> <1178035058.5791.333.camel@localhost.localdomain> <46377055.2060605@rtr.ca> <1178092035.5791.349.camel@localhost.localdomain> <20070502010527.e64dcce9.akpm@linux-foundation.org> Content-Type: text/plain Date: Wed, 02 May 2007 17:40:57 +0200 Message-Id: <1178120457.25504.17.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1216 Lines: 32 On Wed, 2007-05-02 at 01:05 -0700, Andrew Morton wrote: > > thanks. Can you apply this patch please: > > http://lkml.org/lkml/2007/4/13/190 > > > > It somehow did not make it into 2.6.21. > > > > Alas, poor me. I ain't going to merge a contention-reduction patch when > we're at -rc6. If a patch fixes a bug, please tell me! It was not a bug fix at this point, I merily tried to solve the lock contention problem, which was reported by Steven Rostedt. The confusing thing on Marks config bisecting was that the softlock detection fixed his problem. The only difference of the softlock detection is that it starts the watchdog thread and a one second timer. I was looking into the code and noticed that this patch did not make it. Honestly it was a shot into the dark and I'd really like to know why this makes the problem go away. Mark, did you ever enable CONFIG_PROVE_LOCKING as a single add on to your not working config ? If not, can you please try ? tglx - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/